XStream® Air Flow Tops® replace the top of your existing round filter adding filter area. It also redirects airflow inside the filter to pull in more air for even greater performance efficiency. Cleanable and reusable, the XStream® Air Flow Top filter delivers the best protection available for your engine, and comes in a wide range of applications. Sizes include 9-, 11- and 14-inch diameters. The 14-inch tops are available in anodized black, red, blue or polished aluminum trim ring.